Added Source Chapter and Source Page entities.

MangaReader.Core/Data/SourcePage.cs

@@ -0,0 +1,12 @@
+namespace MangaReader.Core.Data;
+
+public class SourcePage
+{
+    public int SourcePageId { get; set; }
+
+    public int SourceChapterId { get; set; }
+    public required SourceChapter Chapter { get; set; }
+
+    public int PageNumber { get; set; }
+    public required string Url { get; set; }
+}